I would recommend following the steps in the below link. It has detail information on how to fix this issue. Mine was same as you and it fixed. Though I lost a few apps and contacts. But did have a back up in my SD card and re installed them. Watch out and test your phone when installing the apps one by one and you could narrow down the culprit.
Force close error or process stops unexpectedly Android
Good luck and Merry Christmas.
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